package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @author 刘宇
 * 自定义切面,实现公共字段自动填充
 */
@Component
@Aspect
@Slf4j
public class AutoFillAspect {
    /*
    切入点
    对execution 这个包进行和添加了该注解的进行自动填充字段
    拦截
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}
    //增强
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始对公共字段进行填充...");
        //获取到当前被拦截方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();
        //获取到当前被拦截的方法参数--实体对象
        Object[] args=joinPoint.getArgs();
        if(args==null&&args.length==0){
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId= BaseContext.getCurrentId();
        //根据当前不同的操作类型,为对应的属性通过反射赋值
        if(operationType==OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setUpdateTime=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                Method setCreateUser=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                //赋值
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
                setCreateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }else if(operationType==OperationType.UPDATE){
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser=entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }

    }
}
